Janet Jackson Janet Jackson

Plagued by an undisclosed illness that had her hospitalized last week, Janet Jackson has postponed three more concerts on her Rock Witchu tour, The Associated Press reports.

The 42-year-old arrived in Greensboro, N.C. for the Saturday show, but canceled after a local doctor determined it was "evident" she was not fully recovered, her rep said.

Sunday's show in Atlanta and Tuesday's in Fort Lauderdale were also postponed.

Jackson fell ill shortly before taking the stage in Montreal last Monday and was hospitalized for two hours. She subsequently delayed shows in Boston and Philadelphia.

Concertgoers are advised to hold on to their tickets as Jackson is hoping to reschedule dates.